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【单选题】
三相感应电动机等效电路中的附加电阻 (1-s) R'2/s上所消耗的电功率应等于( )。A.
输出功率P2
B.
输入功率P1
C.
电磁功率Pem
D.
总机械功率PΩ
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反馈参考答案：
举一反三
【简答题】杆件抗弯刚度绝对值 EI 与杆长 L 之比，称为______。
【简答题】请以打字的形式提交第三段课文微课视频讲解的单词和短语。
【单选题】听力原文：W: When was the last time you cleaned this apartment? M: When was the last time my mother came over? Q: What does the man mean? (17)
A.
He hasn't had time to find another apartment.
B.
His mother cleaned his apartment every day.
C.
He hasn't cleaned the apartment since his mother came to see him.
D.
His mother was the last person to come over to his apartment.
【单选题】When did the Taleban capture Taloqan?
A.
Last September.
B.
Last week.
C.
Last year.
D.
Last December.
【单选题】-----______you received the news ? ------Last night .
A.
When was it that
B.
When was it
C.
When it was that
D.
When it was
【单选题】听力原文：W: When was the last time you dusted this apartment? M: When was the last time my mother came over? Q: What does the man mean? (17)
A.
He hasn't had time to find another apartment.
B.
His mother dusted her apartment the day before last.
C.
He hasn't cleaned the apartment since his mother visited.
D.
His mother was the last person to come over to his apartment.
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